Process of obtaining prints on fabrics.



lfllll'dll) li lR/faNKIEOE-T-ON-THE-MAIN, GERMANY.

appneariou files retainers- To all whom it may concern Be it linown that l, OTTO v Nnusnnonn,

manufacturer, a citizen of the Empire of Germany, residing at, l rankfortromthe Main,- Germany, have invented certain new and useful improvements in the Process of Obtaining Prints on Fabrics, of which the following is a specification.

My present invention relates to the print ing of stufifs. stulis, which can be lined on fabrics "with the aid of the lithographic or boolmprinting process by applying the dyestufi', after being very finely ground together with a varnish or an o'ii, upon the iabric previously prepared with an alkali and a reducing-agent, and fixing the thus applied dyestufi by subsequent steaming.

The prints obtained by theabove-mentioned process are of excellent fastness to Washing and rubbing, because, in conse quence oi the reduction effected by the steaming, the color is thoroughly fixed on the fiber. This result is an unexpected one inasmuch as it could not be foreseen that the presence of a varnish produces no detrimental effect upon the reduction and lining of the dyestufi' and the purity of the prints obtainable thereby. The process may be modified by first printing the color and subsequently applying the alkali and the reducing agent.

Furthermore I have found that the reducing substance serving as an agent for l have found that reduction-dyethe fixing of the color may also, with ad-\ vantage, be added to the lithographic or book-printing-color containing varnish. In this case no reducing agent or only a small quantity of it need be used for the preparation of the fabric, whereby a great saving is effected. This also renders it possible to conform in every case thequantity of the reducing agent to "be used exactly to the quantity of the dyestuil', whereby more even prints are obtained. For this process the insoluble, stable hvdrosulfite compounds are particularly suitable. The reduction-dyestuffs may also be used in the form of their leuco compounds for the preparation of the printing colors. For the impregnation. of

fabrics by means of reduction-dye such as vator sulfurdyestuils, are remarkable for their fastness,-

s ecification of Letters Blatant. Patient-nail Asp r 13, ,j'flilfi,

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assess there may, for instance, be used a solution of the following composition:

30 grams of Wheat starch; 895 grams of Water heated to boiling, and added lukewarm; 50 grams of calcined sodium can bonatc; grams ofhydrosulfite NF concentrated.

.The following examples vention:

, Example l: 150 grams of helindone violet it powder (ee-diniethyl-ii.5-dichloro-7,7-dimethyloaythioindigo) are finely ground in the usual manner together with 100 grams of printers varnish and printed on the fabric previously prepared and calendered. After drying, the goods are steamed for 5 minutes or longer" above 100 6., prefer ably with steam free from air, and then Well Washed and soaped at the boil for completely developing the shade, whereupon they are again Washed and dried. llnstead of previously preparing the fabric, the pregnation' of the unprepared fabric may be efi'ectedwith the'above-mentioned impregnating-liquid after the color has been applied. v

Example H: The fabric may be prepared yvith a solution of'the following composition: grams of 'Wheat starch are boiled with 920987 grains of Water and there are then added lukewarm 10O grams of calcined sodium carbonate. The fabric to be printed is impregnated with this solution, then dried and calendered.

The printing-process is carried out as fol illustrate my inlows: 100 grams of helindone red 3B powder (5.5 dichloro 7 .7 L dimethylthioindigo) are finely ground together with 300 grams of zinc-formaldehyde-sulfoxylate and 200 grams of varnish and printed on the fabric prepared with alkalis as above indicated. After Well drying, the fabric is steamed for 5 minutes or longer above 100 (3., Well Washed and soaped at the boil for come pletely developing the shade, and finally again washed and dried.

llxample III: The procedure is the same as indicated in Example ll except that the composition of the printing-color is to be as follows: 100 grains of helidone red 38 in form of its leuco compound, 150 grams of zineformaldehydesulfoxylate, 350 grams of varnish.

It may be remarked that in all of the three examples the quantity of the alkali and the reducing agents may be varied within wide limits, accordingly as required.

Having. now described my invention what I claim is; A

l. The process of obtaining designs 'on fabrics, which consists in applying on the fabric reduction dyestuffs finely ground.

with varnish or an oil by means of'the lithographic printing process and developing the prints thus obtained by steaming in presence of an alkali and reducing agents. 2. The process of obtaining designs on fabrics, which consists in applying on the fabric reduction dyestulfs inthe form of.

- leucogcompounds finely ground with varnish or an oil by means of the lithographic printing process, and developing the prints thus obtained by steaming in presence of an alkali and reducing agents.

3. The process. of obtaining designs 'on fabrics, which consists in first impregnating i the fabr icwith a solution of an alkali and reducing agents, then applying reduction dyestnifs' finely ground with ,varnish or an oil by means'of the lithographic printing 7 processaand' developing the prints thus ob tained by steaming inpresence of an alkali and reducing agents' 4. vThe rocess of obtaining designs on fabrics, w ich consists in first impregnating the fabric with an alkali, then applying reduction dyestuffs mixed with a reducing agent and finely ground with varnish or anoil, by means of the lithographic printing printing process, and developing the prints thus obtained by steaming in presence of an alkali and reducing agents.

In testimony whereof I aflix my signature in presenceof two witnesses.

orTo NEUBERGER.

Witnesses J nan GBUND, CARL GRUND. 

